student_scores = {
    "Anna": 90,
    "Tom": 78,
    "Jerry": 85,
    "Lucy": 92
}

print(student_scores.keys())
print(student_scores.values())
student_scores['wangjiahe']=1000000000000
print(student_scores)
student_scores['wangjiahe']=33
del student_scores['wangjiahe']

print(student_scores['Tom'])
